MSD 8225 HEI Distributor Coil, GM


  • Upgrade your stock coil
  • For GM HEI distributors
  • Increased spark energy
  • Epoxy-filled construction
Due to world events we are working with our manufacturers every day to ship and receive parts. If the part you are looking for is time sensitive please give our team a call at 855-806-1147 before ordering to ensure it's availability.
SKU: MSD8225 Category:

HEI owners now have a choice to replace their stock coil with the MSD High Energy Unitized Coil for GM HEI Distributors. This coil is a direct replacement of the stock coil and offers increased spark energy when used with the MSD HEI Module, PN 83647.

The coil features special low induc­tance, high temperature windings which charge faster to give you increased spark energy at higher rpm. The premium epoxy filled construction is designed to withstand harsh race applications as well as the wear and tear that daily usage dishes out, and still deliver more spark energy to the spark plugs.


  • Direct performance replacement for GM HEI coil-in-cap distributors
  • 70:1 turns ratio and lower primary resistance produce high voltage output
  • Full power sparks to 9,000 RPM when used with 83647 MSD HEI Module
  • Recommended for use with MSD HEI Module PN 83647
  • CARB E.O. Approved


  • Inductance 3.5mH
  • Maximum voltage 42,000
  • Peak current 200mA
  • Primary resistance .31 OHMs
  • Secondary resistance 9.2K OHMs
  • Spark duration 200uS
Weight 1.71875 lbs
Dimensions 5 × 6 × 10 in





Manufacturer Part Number


MSD GM HEI Distributor Coil

Offers increased spark energy when used with MSD HEI HEAT Module.

HEI owners can now replace their stock coil with the MSD High Energy Unitized Coil for GM HEI Distributors.

Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to